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T.I Building is a trusted extension builder serving customers in Lisburn and the surrounding area. Contact us to today to get a competitive quote f...
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
Relax... you have found a reliable extension builder in Lisburn. SM Plumbing & Heating is a friendly and reliable company based in Lisburn who cons...
From £87,004
Trusted and professional extension builder in Lisburn. Experienced in all extension buildering work and keeping within budget and on quote. Belfast...
From £87,076
Relax... you have found a reliable extension builder in Lisburn. Finch Construction NI is a friendly and reliable company based in Lisburn who cons...
From £86,764
Trusted and professional extension builder in Lisburn. Experienced in all extension buildering work and keeping within budget and on quote. Extende...

Costs range from £86,704 (Mount Oriel Conversions & Extensions based in BT8) to £87,232 (AK Building Services based in BT8), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Two Storey Extension near Lisburn | £24 | £164 |
| Two Storey Extension near Hillsborough and Culcavy | £25 | £170 |
| Two Storey Extension near Maghaberry | £31 | £205 |
| Two Storey Extension near Carryduff | £23 | £158 |
| Two Storey Extension near Belfast | £23 | £161 |
| Two Storey Extension near Crumlin | £26 | £194 |
| Two Storey Extension near Saintfield | £23 | £162 |
| Two Storey Extension near Ballynahinch | £19 | £189 |
| Two Storey Extension near Waringstown | £23 | £167 |
| Two Storey Extension near Comber | £22 | £160 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £16,827

Two storey extension - £86,990

Build a timber frame extension - £25,327

Build a swimming pool - £80,327

Single storey extension - £41,537

Side return extension - £33,927

Install an RSJ - £1,527

Outbuilding - £9,327

Build a Mansard loft conversion - £51,327

Loft conversion - £27,439

Build a kitchen extension - £41,327

Hip to gable loft conversion - £41,327

Granny annexe - £86,327

Garden office - £9,327

Convert a Garage - £15,327

Garage - £17,827

Build a flat roof extension - £21,327

Build a dormer loft conversion - £41,327

Concrete foundations - £5,577

Convert a bungalow loft - £28,327

Convert a basement - £29,927